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Published byΤισιφόνη Γιάνναρης Modified over 5 years ago
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Meiosis Cell division that makes 4 genetically different daughter cells Occurs in sex cells (sperm & eggs) called gametes Chromosome Number per cell is cut in half, which is called the haploid number
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Meiosis Stages 2 stages Meiosis I (ALMOST LIKE MITOSIS)
Meiosis II (JUST LIKE MITOSIS)
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Three special things that happen in Meiosis
Synapsis (Prophase I) Crossing Over (Prophase I) Reduction/Division
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1. Synapsis Happens during Prophase 1
Synapsis: each pair of homologous chromosomes line up gene by gene Homologous chromosomes are chromosomes that have the same genes in the same place
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Homologous Chromosomes
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2.Crossing Over Crossing-over chromosomes exchange genetic information.
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It is because of crossing over, you don’t look exactly like your mom or dad and we have greater genetic diversity
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3. Reduction Division Meiosis goes through two divisions
Meiosis REDUCES the number of chromosomes in each cell The result is 4 GENETICALLY DIFFERENT HAPLOID cells. That means 4 cells, with half the number of chromosomes that are different from each other. HAPLOID MEANS HALF
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92 46 46 23 23 23 23
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Either 4 sperm are made OR 1 egg and 3 polar bodies Spermatogenesis is the making of sperm Oogenesis is the making of eggs * You start with the diploid number (92/46) and you end with the haploid number (23)
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Mitosis vs Meiosis Mitosis Meiosis Results in 2 Diploid Cells (2n)
4 Haploid Cells (n) Cells are Genetically Identical Genetically Different Process Cell division Reduction division Occurs in Somatic (Body) Cells Sex Cells
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